Memory Expansion A500(+)

Trapdoor Slot Expansions 512K/1MB with Optional Clock

These memory expansions for the trapdoor expansion slot expand the
Amiga 500 by 512 KB FastMem (or ChipMem if the A500 has been
modified accordingly), or your Amiga 500 Plus by 1 MB ChipMem,
respectively. Both expansions are available with or without battery-backed
real time clock (RTC).

512 KB memory expansion for Amiga 500 (without and with RTC)

1 MB memory expansion for Amiga 500 Plus (without and with RTC)

You should only buy the 1 MB card with RTC for the Amiga 500 Plus if the
computer's internal RTC is broken. (Deactivating the original RTC requires soldering,
jumper JP9 must be closed.)